(20 U.S.C. 6301 et. seq.), as amended by this Act, from programs. authorized under the Elementary and Secondary Education Act. of 1965 (20 U.S.C. 6301 et seq.), as in effect on the day before. the date of enactment of this Act.
The efficacy of a vaccine is different from its effectiveness. It is dependent on several factors such as: 1  adherence to vaccine schedules. 2  the disease â some diseases have vaccines against them that perform better than for other diseases. 3  the strain of vaccine â some vaccine strains are more effective than others.
DNA vaccines are able to stimulate cell-mediated immunity whereas traditional vaccines stimulate humoral immunity. Traditional vaccines have been developed against numerous bacterial and viral pathogens, but the development of vaccines against many important viruses has been elusive.Generally where immunization has been successful, the host immune system makes neutralizing antibodies against the pathogen.raditional vaccines have been developed against numerous bacterial and viral pathogens, but the development of vaccines against many important viruses has been elusive. Generally where immunization has been successful, the host immune system makes neutralizing antibodies against the pathogen.